Malicious PDF — malware analysis report

Static analysis result for SHA-256 5724cbaff3a3529f…

MALICIOUS

PDF

45.7 KB Created: 2020-10-11 19:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9b06896f1f4f1d0cd353b743097a6cdc SHA-1: d8d83935b00154899b2218674710f88fb7b2f07a SHA-256: 5724cbaff3a3529f65f9eb9a515173b486d69feda6c38a4e02bf00c1232342eb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://gettraff.ru/strik?keyword=swot+analizi+%25C3%25B6rne%25C4%259Fi+word'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, one of which is to 'https://cdn.shopify.com/s/files/1/0437/6382/6849/files/pokemon_gen_3_gym_leaders.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body contains obfuscated text and the malicious URL, suggesting an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gettraff.ru/strik?keyword=swot+analizi+%25C3%25B6rne%25C4%259Fi+word In PDF document text
    • https://site-1040888.mozfiles.com/files/1040888/pemikifulozipu.pdfIn PDF document text
    • https://site-1037265.mozfiles.com/files/1037265/30395106392.pdfIn PDF document text
    • https://site-1040125.mozfiles.com/files/1040125/wuwajomirazinupewiz.pdfIn PDF document text
    • https://site-1040358.mozfiles.com/files/1040358/59300919592.pdfIn PDF document text
    • https://site-1039950.mozfiles.com/files/1039950/wijumazigasefomuvisek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6382/6849/files/pokemon_gen_3_gym_leaders.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5800/4117/files/78421707196.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/2897/9096/files/zegixojapaxikafomim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6587/9957/files/wood_wind_chimes_canada.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2556/3799/files/ultrasonic_cavitation_reviews_2018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/4932/5222/files/net_christmas_lights_bunnings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12dcb701-77f6-4a45-b190-2306928c2977/83251513611.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0da62c5e-c9e2-4664-8a29-1f34e741764e/10460079946.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84d4c555-799a-414f-8de7-789d1b1eba4a/zivoripoza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84800f80-492b-4389-99e2-7a8236237c4f/beketeponeselam.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000672a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x672A 5256 bytes
SHA-256: 36ac1cd62465313013a0b18c7c54e0f70d5d910b4a8086a8368b6d002a2de285
font_01_sfnt_off000078dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78DD 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off0000816b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x816B 12036 bytes
SHA-256: 815e238d8d78605749e2b357b8fa32631316e8a691a79986aa0e367fcc1b61a0

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